As
@Cotswold Vapour says - you can’t go wrong with the Kerns - we use a different companies now that do 15kg but I can’t remember who they are! We used those kerns for ages tho -what you need to look for is resolution - the smaller the amounts your making - the higher resolution you need (because .5 of a gram over in 500ml is more of an inaccuracy than .5 of a gram over in 10ltrs)
so look for scales that resolve to like .01 or something. Also get a bit bigger than you need - so if you are mixing 1ltr at a time get scales that will do up to say 6 or 8 - you don’t want to have to buy another set in 3 months if your sales expand.